Green’s Dictionary of Slang

1. a whiff, a smell.

1841		Dickens Old Curiosity Shop (1999) 63: The gush of tobacco came from the shop.
1859		G.A. Sala Gaslight and Daylight 43: A gush of fish, stale and fresh, stretches across Thames Street.

2. (US) a good deal of a commodity.

1849		Knickerbocker (N.Y.) XXXIV 407/2: Shese a powerfull big boat, and kin tote a gush of pork.
1859		Bartlett Dict. Americanisms (1968) 186: Gush. A great abundance. A Texan would say, ‘We have got a gush of peaches in our neck of the woods.’.
1889		Farmer Americanisms 282/1: Gush. – A large quantity; abundance; e.g., a gush of cattle, fruit, etc.